import java.util.Scanner;

// 能否构成三角形
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNextDouble()) {
            double a = scanner.nextDouble();
            double b = scanner.nextDouble();
            double c = scanner.nextDouble();

            if(a + b > c && a + c > b && c + b > a)
                System.out.println("Yes");
            else
                System.out.println("No");
        }
    }
}